Vehicle spawn system slowly eating RAM - entities not cleaning up properly?

function spawnVehicle(model, coords)
    local ped = GetPlayerPed(source)
    local veh = CreateVehicleServerSetter(GetHashKey(model), coords.x, coords.y, coords.z, coords.w)
    local netId = NetworkGetNetworkIdFromEntity(veh)
    -- Store entity handle in global table
    VehicleManager[netId] = { entity = veh, owner = source }
    -- No validation of entity creation success
    return netId
end

-- Deletion doesn't validate if entity still exists
function deleteVehicle(netId)
    local veh = VehicleManager[netId].entity
    DeleteEntity(veh) -- May fail if entity already cleaned up by OneSync
    VehicleManager[netId] = nil
end